Rhinebeck01
Well-Known Member
- Joined
- May 9, 2018
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- Vehicle(s)
- '18 JL Rubi, '22 Prevost M H3-45,'01 Harley FatBoy
@brewtus98You don't happen to know if TSB 18-041-18 REV B will implement the fix that allows the Jeep to start with low Aux Battery do you? It was superseded by TSB 18-092-19 on 11/6/19. It looks like they just updated the "symptom conditions" with DTC's that could be present. I just want to make sure the software "fix" for both of the TSB's is the same. I got the TSB done for the loud cooling fan, but want to make sure I got the aux battery enhancement too.
In other words, If I got the older TSB done, should I take it back and have it updated with the newer version even though they look exactly the same with exception of the list of potential DTC's? Unfortunately neither TSB list the revision number of the software they flash so that I can compare.
I and other's here had TSB 18-041-18 Rev B applied and it did not see/get what TSB 18-092-19 accomplished, in regard to how the dual battery system was handled.
Suggest you test to see IF, if your JL say at the factory (some 2018's did) or afterwards at dealership, had the PCM updated so it behaves like a 2019-2021 JL.
Disconnect the ESS negative cable on your JL. (#6 in the pic below) .....Now try to start the JL.
IF the JL starts on the second try then it behaves like a 2019-2021. You will also see an EVIC light come on, but once you reconnect the ESS negative, in a short time frame the EVIV light will go out on it's own. IF it does not behave like a 2019-2021, it just won't start..
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